I have painted many times using two part epoxy paints. Here are the steps. Use a high quality respirator at all times. You can read up on this at the Interlux web site. Some paint have arsenic in them--Algrip for example. Breath this and you may not wake up tomorrow.
1. Repair and fill any cracks or voids. Removing windows
and fixtures is better but you can tape around anything left on.
2. Sand the whole thing using a 6" random orbital sander with 100 grit. Wipe down with recommended solvent. I also use 5" random orbital palm sanders and foam waning blocks.
3. Roll or spray, (spraying is better) 2 coats Interlux 2000E primer. Use white for light
colors and gray for dark colors. Sand between coats with 150 grit. With the last coat sand with finer and finer grits all the way to 600 grit or finer. Each finer sanding takes half the time of the prior sanding. It is all in the prep. You do not want and bubbles or voids. The follow on paint is thin and will not fix defects in your prep. Use filler if you have any problem areas you missed earlier and then prime those too.
4. Wipe with lint free cloth and solvent.
5. You can use the tip and roll method with two people to paint it, or preferably, spray three coats of well thinned Interlux Perfection paint. Tip and Roll is actualling Roll and Tip. one lerson rolls vertically and the next person, using the lightest of touch drags the tip of a foam brush horizonatly to pop the bubbles. Thin paint then helps the paint to flatten the drag marks. timing is critical using Tip and Roll. The tipping must happen soon after the dolling. Paint can be thinned with up to 40% of the recommended thinner. Thinner coats turn out better. If you have any runs, sand them out and hit it again. Spray painting works better and faster but requires more prepping. My helper ruined two compasses when spray paint floated overand dried on them.
6. For a contrasting color, you can go on top of a light
color with a dark, but the preferred method is to use a dark primer and paint the contrasting color separately, unless you are making a complicated pattern on top of a base coat.
7. Be sure to wax twice a year to protect the paint.